Doorknob



DOORKNOB Filed March 19, 1945 INVENTOR.

wmmwza a- Patented Dec. 23, 1947 DOORKNOB Walter R. Schlage, Burlingame, CaliL; Anna Schlage, executrix of said Walter It. Schlage, deceased, assignor to Schlage Lock Company, San Francisco, Calii'., a corporation of Californla Application March 19, 1945, Serial No. 583,573

1 Claim. 1

This invention relates to door knobs and the like and particularly to a structure whereby a knob made from a plastic material may be applied and rigidly secured to a, tubular metallic reenforcing member.

The object of the present invention is generally to improve and simplify the construction and operation of knobs. of the character described and especially to provide a structure whereby a knob made from a plastic material may be applied and rigidly secured to a tubular metallic reenforcing member, and this in turn is secured to the metallic spindle of a door lock of the like.

The knob and its metallic reenforcing member is shown by way of illustration in the accompanying drawings in which:

Fig. 1 is a central vertical section of the knob and the reenforcing member showing them assembled;

Fig. 2 is a perspective view of the tubular me- I ed or machined from a plastic material such as Bakelite, Lucite or similar plastics. The knob has a central opening formed therein and extending longitudinally therethrough. An annular shoulder 2 is formed adjacent one end of the opening, and a plurality of recesses 3 terminating in shoulders 4 are formed adjacent the opposite end of the knob.

The securing of a knob formed or made from plastic material to a metal spindle is a problem, and is difficult due to the lack of strength in such materials. To overcome this difllculty a tubular metallic reenforcing member B is employed. This member is closed at its outer end by a cap 5 which is permanently secured, and this cap engages the shoulder 2 when the tubular member is inserted and thereby secures the knob against endwise movement in one direction.

The knob must also be secured against longitudinal movement in the opposite direction, and the knob must also be secured against rotation on the tubular member.

To accomplish this a plurality of bendable prongs or lugs 6 are formed on the tubular member as clearly shown in Fig. 2. It the tube B is made of spring steel or a like material the prongs will be forced inwardly when the tube is inserted in the knob and pushed therethrough, and they will obviously spring outwardly into the recesses formed for their reception the moment the cap engagesvthe shoulder 2. 0n the other hand it the tube is made of soft steel or a like metal the 2 lugs or prongs may be bent outwardly into the recesses by a suitable expanding tool. In either case when the cap engages the shoulder 2 and the prongs engage the shoulders 4 at the ends of the recesses, the knob will be rigidly secured to the tubular member, both against longitudinal and rotational movement.

The tubular member reenforces and strengthens the knob. It forms a means of securing and supporting the knob, and it forms a means for securing the konb as a whole to a metallic spindie as a set screw or any other suitable means may be employed to secure the tubular member to the spindle.

The exterior surface of the knob may be cylindrical; it may be grooved; it may be poly-faced or it may be shaped in any manner to produce various desirable ornamental effects, and while this and other features of the invention have been more or less specifically described and illustrated, it should be understood that changes may be resorted towithin the scope of the appended claim and that the materials and finish of the several parts employed may be such as the experience or judgment of the manufacturer may dictate or varying conditions or uses may demand.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

A door knob having a central passage formed therein and extending longitudinally therethrough, an annular shoulder formed adjacent the outer end of the passage, a plurality of spaced recesses formed adjacent the other end of the passage, each recess terminating in a shoulder, a tubular member insertible in the passage formed in the knob, a plurality of perforations formed adjacent one end of the tube, a cap fit: ting said end of thetube, a plurality of lugs on the cap bent into the perforations on the tube to secure the 'cap against removal from the tube, said cap seating on the annular shoulder, and a plurality of lugs on the tubular member, said lugs being bendable to enter the recesses and engage the shoulders to secure the knob against endwise and rotational movement on the tubular,

member.

WALTER R. SCHLAGE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1 1,653,514 Schlage Dec. 20, 1927 1,721,626 Higley July 23, 1929 2,023,941 Voight Dec. 10, 1935 2,242,508 Ching May 20, 1941 

